testo measurement top tip #1
Answer: Clean the probe!
This may seem obvious but it is important that the probe is protected when being cleaned. Using substances such as household washing-up liquid, detergent or soap will be more than enough to remove any residue left on the instrument; while using kitchen paper or a towel to dry the instrument will eliminate the chances of damaging the probes’ surface. Otherwise, this could potentially diminish the accuracy of the measurement.